The problem involves finding the coefficient of kinetic friction required to stop a train engine with a mass of 10,000 kg, initially traveling at 30 m/s, over a period of 30 seconds. The discussion centers around the forces acting on the train and the calculations needed to determine the friction involved in stopping it.
The discussion is ongoing with various interpretations being explored. Some participants have suggested using kinematic equations to find acceleration, while others express confusion about the forces at play. Guidance has been offered regarding the relationship between friction and the stopping force, but no consensus has been reached on the specifics of the calculations.
Participants note that the problem does not explicitly state certain values, such as acceleration, leading to confusion. There is also mention of the assumption that air resistance can be neglected in this context.
Hello Laura0901. Welcome to PF !Laura0901 said:
Of course you must figure it out from the given information.Laura0901 said:
And, just what force is it that is slowing the train?Laura0901 said:
The train slows to a stop. That's an acceleration. That requires a force. (Ask Mr. Newton.)Laura0901 said:
Then the train's going to keep going in the x direction.Laura0901 said:
Laura0901 said:
Right. It would take very long time to stop.stephen8686 said:
Probably not much. The friction force is stopping a train.Laura0901 said:
